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Characterization of the organic matter in pockmark areas of the Southwestern Atlantic upper slope

2022; SciELO; Volume: 70; Issue: suppl 2 Linguagem: Inglês

10.1590/2675-2824070.22022ral

2675-2824

Rafael André Lourenço, Nathalia Araujo Kunrath, Doris Nagaoka, Caio Augusto Magalhães, Antonio Derley S. Pereira, Basílio Magno Tavares Sotão Neto, Cristian Taboada Timoszczuk, Felipe R. Santos, Guilherme Augusto Pedrão, Lígia Dias de Araujo, Lorena Sampaio Nascimento, Nayara Ferreira Carvalho, Josilene da Silva, Satie Taniguchi, Michel Michaelovitch de Mahiques, Márcia Caruso Bı́cego, Paulo Yukio Gomes Sumida,

Atmospheric and Environmental Gas Dynamics

Pockmarks are circular or elliptical structures formed at the seabed by the expulsion of gas from the subsurface. They are widely distributed along the continental margin off southeastern Brazil and can be over a kilometer wide and 100 meters deep. However, studies concerning the organic characteristics of these pockmark areas are scarce. This study sought to evaluate the organic composition of the sedimentary matter in pockmark areas located in the continental slope region of the southern Brazilian coast. Hydrocarbons, sterols, long-chain alcohols, stable isotopes of C and N, total organic carbon, and total nitrogen were assessed to provide an organic molecular characterization of the pockmarks located in the Southwestern Atlantic Ocean. These compounds did not reflect the organic characteristics of the scape of fluids that generate pockmark structures.